import router from '@/router'
const state = {
  visitedViews: [],
  cachedViews: []
}

const mutations = {
  ADD_VISITED_VIEW: (state, view) => {
    if (state.visitedViews.some(v => v.path === view.path)) return
    state.visitedViews.push(
      Object.assign({}, view, {
        title: view.meta.title || 'no-name'
      })
    )
  },
  ADD_CACHED_VIEW: (state, view) => {
    if (state.cachedViews.includes(view.name)) return
    if (!view.meta.noCache) {
      state.cachedViews.push(view.name)
    }
  },

  DEL_VISITED_VIEW_BY_NAME: (state, view) => {
    for (const [i, v] of state.visitedViews.entries()) {
      if (v.name === view.name) {
        state.visitedViews.splice(i, 1)
        break
      }
    }
  },
  DEL_VISITED_VIEW: (state, view) => {
    for (const [i, v] of state.visitedViews.entries()) {
      if (v.path === view.path) {
        state.visitedViews.splice(i, 1)
        break
      }
    }
  },
  DEL_CACHED_VIEW: (state, view) => {
    const index = state.cachedViews.indexOf(view.name)
    index > -1 && state.cachedViews.splice(index, 1)
  },

  DEL_OTHERS_VISITED_VIEWS: (state, view) => {
    state.visitedViews = state.visitedViews.filter(v => {
      return v.meta.affix || v.path === view.path
    })
  },
  DEL_OTHERS_CACHED_VIEWS: (state, view) => {
    const index = state.cachedViews.indexOf(view.name)
    if (index > -1) {
      state.cachedViews = state.cachedViews.slice(index, index + 1)
    } else {
      // if index = -1, there is no cached tags
      state.cachedViews = []
    }
  },

  DEL_ALL_VISITED_VIEWS: state => {
    // const affixTags = state.visitedViews.filter(tag => tag.meta.affix)
    state.visitedViews = []
  },
  DEL_ALL_VISITED_VIEWS_EXCEPT_AFFIX: state => {
    // keep affix tags
    const affixTags = state.visitedViews.filter(tag => tag.meta.affix)
    state.visitedViews = affixTags
  },
  DEL_ALL_CACHED_VIEWS: state => {
    state.cachedViews = []
  },

  UPDATE_VISITED_VIEW: (state, view) => {
    for (let v of state.visitedViews) {
      if (v.path === view.path) {
        v = Object.assign(v, view)
        break
      }
    }
  }
}

const actions = {
  // 在页面中，主动关闭页面、去除tab标签
  // 使用方法  this.$store.dispatch('tagsView/closePage', 页面路由名称)
  closeCurPage({
    dispatch,
    state
  }) {
    dispatch('delViewByName', { name: router.app._route.name }).then(({
      visitedViews
    }) => {
      const latestView = state.visitedViews.slice(-1)[0]
      router.push(latestView ? latestView.fullPath : '/')
    })
  },

  // 使用方法  this.$store.dispatch('tagsView/closePage', 页面路由名称)
  closePage({
    dispatch,
    state
  }, name) {
    dispatch('delViewByName', { name }).then(({
      visitedViews
    }) => {
      if (name === router.app._route.name) {
        const latestView = state.visitedViews.slice(-1)[0]
        router.push(latestView ? latestView.fullPath : '/')
      }
    })
  },

  closePageTo({
    dispatch,
    state
  }, name) {
    const { closeName, toPath } = name
    dispatch('delViewByName', { name: closeName }).then(({
      visitedViews
    }) => {
      if (closeName === router.app._route.name) {
        if (toPath) {
          router.push(toPath)
        } else {
          const latestView = state.visitedViews.slice(-1)[0]
          router.push(latestView ? latestView.fullPath : '/')
        }
      }
    })
  },

  addView({
    dispatch
  }, view) {
    dispatch('addVisitedView', view)
    dispatch('addCachedView', view)
  },
  addVisitedView({
    commit
  }, view) {
    commit('ADD_VISITED_VIEW', view)
  },
  addCachedView({
    commit
  }, view) {
    commit('ADD_CACHED_VIEW', view)
  },

  delView({
    dispatch,
    state
  }, view) {
    return new Promise(resolve => {
      dispatch('delVisitedView', view)
      dispatch('delCachedView', view)
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      })
    })
  },
  delViewByName({
    dispatch,
    state
  }, view) {
    return new Promise(resolve => {
      dispatch('delVisitedViewByName', view)
      dispatch('delCachedView', view)
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      })
    })
  },
  delVisitedViewByName({
    commit,
    state
  }, view) {
    return new Promise(resolve => {
      commit('DEL_VISITED_VIEW_BY_NAME', view)
      resolve([...state.visitedViews])
    })
  },
  delVisitedView({
    commit,
    state
  }, view) {
    return new Promise(resolve => {
      commit('DEL_VISITED_VIEW', view)
      resolve([...state.visitedViews])
    })
  },
  delCachedView({
    commit,
    state
  }, view) {
    return new Promise(resolve => {
      commit('DEL_CACHED_VIEW', view)
      resolve([...state.cachedViews])
    })
  },

  delOthersViews({
    dispatch,
    state
  }, view) {
    return new Promise(resolve => {
      dispatch('delOthersVisitedViews', view)
      dispatch('delOthersCachedViews', view)
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      })
    })
  },
  delOthersVisitedViews({
    commit,
    state
  }, view) {
    return new Promise(resolve => {
      commit('DEL_OTHERS_VISITED_VIEWS', view)
      resolve([...state.visitedViews])
    })
  },
  delOthersCachedViews({
    commit,
    state
  }, view) {
    return new Promise(resolve => {
      commit('DEL_OTHERS_CACHED_VIEWS', view)
      resolve([...state.cachedViews])
    })
  },

  delAllViews({
    dispatch,
    state
  }, view) {
    return new Promise(resolve => {
      dispatch('delAllVisitedViews', view)
      dispatch('delAllCachedViews', view)
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      })
    })
  },
  delAllViewsExceptAffix({
    dispatch,
    state
  }, view) {
    return new Promise(resolve => {
      dispatch('delAllVisitedViewsExceptAffix', view)
      dispatch('delAllCachedViews', view)
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      })
    })
  },
  delAllVisitedViews({
    commit,
    state
  }) {
    return new Promise(resolve => {
      commit('DEL_ALL_VISITED_VIEWS')
      resolve([...state.visitedViews])
    })
  },
  delAllVisitedViewsExceptAffix({
    commit,
    state
  }) {
    return new Promise(resolve => {
      commit('DEL_ALL_VISITED_VIEWS_EXCEPT_AFFIX')
      resolve([...state.visitedViews])
    })
  },
  delAllCachedViews({
    commit,
    state
  }) {
    return new Promise(resolve => {
      commit('DEL_ALL_CACHED_VIEWS')
      resolve([...state.cachedViews])
    })
  },

  updateVisitedView({
    commit
  }, view) {
    commit('UPDATE_VISITED_VIEW', view)
  }
}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}
